Creating primary defects in calcium fluoride crystals with various prehistories, using pulsed electron irradiation

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1 Citation (Scopus)

Abstract

Optical spectroscopy with nanosecond resolution has been used to study how the prehistory (the presence of impurities, heat treatment) of CaF 2 crystals affects the processes of creating autolocalized excitons (AEs) under the influence of a pulse of accelerated electrons. The breakdown of the dispersivity condition for the creation of AEs is detected in a nominally pure, nonheat-treated crystal. It is shown that the initial structural defects play a defining role in creating the initial defect density. A model of the radiation disordering of an actual fluorite crystal is constructed. An analogy is traced to the processes of impurity and thermal disordering.

Original languageEnglish
Pages (from-to)396-403
Number of pages8
JournalPhysics of the Solid State
Volume41
Issue number3
Publication statusPublished - Mar 1999

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Calcium Fluoride
Calcium fluoride
calcium fluorides
Electron irradiation
electron irradiation
Excitons
Defects
Crystals
defects
excitons
Impurities
crystals
impurities
Fluorspar
Defect density
fluorite
heat treatment
breakdown
Heat treatment
Radiation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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AB - Optical spectroscopy with nanosecond resolution has been used to study how the prehistory (the presence of impurities, heat treatment) of CaF 2 crystals affects the processes of creating autolocalized excitons (AEs) under the influence of a pulse of accelerated electrons. The breakdown of the dispersivity condition for the creation of AEs is detected in a nominally pure, nonheat-treated crystal. It is shown that the initial structural defects play a defining role in creating the initial defect density. A model of the radiation disordering of an actual fluorite crystal is constructed. An analogy is traced to the processes of impurity and thermal disordering.

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